单选题:What does the phrase "this problem" in Paragraph 3 refer to?

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题目内容:
What does the phrase "this problem" in Paragraph 3 refer to? A.Most studies were typical and not general.
B.Most studies made a detailed study of people.
C.It's difficult to separate the use of social network from other factors.
D.There are some other factors affecting well-being.

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答案解析:

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